Methods and systems for determining optimum wake time

• US 8,948,861 B2
• Filed: 03/31/2011
• Issued: 02/03/2015
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Kalik, Steven F., Rai, Deepti Dunichand
• Primary Examiner(s): Natnithithadha, Navin
• Assistant Examiner(s): WEARE, MEREDITH H
• Application Number:
  US13/077,557
• Publication Number:
  US 20120253220A1
• Time in Patent Office: 1,405 Days
• Field of Search: 600/544, 600/545, 340/575
• US Class Current: 600/545
• CPC Class Codes: A61B 5/369 Electroencephalography [EEG] devices for psychotechnics A61B5/16
• CPC Class Codes: A61B 5/4806 Sleep evaluation A61B5/4821 takes precedence; devices for inducing sleep A61M21/02

Abstract

A system for determining optimum wake time is disclosed whereby the system comprising includes a receiver for receiving electroencephalogram (EEG) data. The system further includes a processor configured to generate at least one frequency band based on the EEG data received, wherein the processor is further configured to determine an optimum wake time based on a relative low point on the at least one frequency band. The system also includes an indicator configured to provide notification of the optimum wake time.

Claims

1. A system for determining optimum wake time, the system comprising:

a receiver for receiving and storing electroencephalogram (EEG) data and a user-specified sleep period;

a processor configured to;

determine a dominant oscillation of power within a frequency band based on past EEG data received;

generate a power profile within the frequency band based on current EEG data received; and

determine the optimum wake time using the dominant oscillation of power to predict one of a relative low point and relative high point on the power profile proximate in time to and before the end of the user-specified sleep period; and

an alarm including an indicator configured to provide a stimulus to wake the user at the determined optimum wake time.

2. The system of claim 1, wherein the receiver includes a sensor adapted to monitor brain activity of a user.

3. The system of claim 1, wherein the frequency band is a delta band, and wherein the processor is configured to determine the optimum wake time based on the relative low point on the power profile within the delta band.

4. The system of claim 1, wherein the receiver is an input device capable of receiving and storing data associated with circadian oscillators and wherein the determination of the optimum wake time is also based on the data associated with the circadian oscillators.

5. The system of claim 1, wherein the receiver is an input device capable of receiving and storing data associated with sleep debt or sleep propensity and wherein the determination of the optimum wake time is also based on the data associated with sleep debt or sleep propensity.

6. The system of claim 1, wherein the processor is further configured to:

send a signal to activate the indicator during the relative low point or the relative high point corresponding to the optimum wake time.

7. A system for determining optimum wake time, the system comprising:

a receiver for receiving and storing electroencephalogram (EEG) data and a user-specified sleep period;

a processor configured to;

determine a dominant oscillation of power within a frequency band based on past EEG data received;

generate a delta power rhythm associated with sleep depth based on current EEG data received; and

determine the optimum wake time;

wherein the optimum wake time is determined based on using the dominant oscillation of power to predict a relative low point on the curve of the delta power as plotted against sleep cycle time;

wherein the relative low point occurs before the end of the user-specified sleep period; and

wherein the relative low point corresponds to the optimum wake time resulting in minimal sleep inertia; and

an alarm including an indicator configured to provide a stimulus to wake the user at the determined optimum wake time.

8. The system of claim 7, wherein the receiver includes a sensor adapted to measure brain activity of a user.

9. The system of claim 7, wherein the receiver is an input device capable of receiving and storing data associated with circadian oscillators and wherein the determination of the optimum wake time is also based on the data associated with the circadian oscillators.

10. The system of claim 7, wherein the receiver is an input device capable of receiving data and storing associated with sleep debt or sleep propensity and wherein the determination of the optimum wake time is also based on the data associated with sleep debt or sleep propensity.

11. The system of claim 7, wherein the processor is further configured to:

send a signal to activate the indicator during the relative low point corresponding to the optimum wake time.

12. A method for determining optimum wake time, the method comprising:

receiving and storing electroencephalogram (EEG) data via a receiver;

determining, using a processor, a dominant oscillation of power within a frequency band based on past EEG data received;

generating, using the processor, a power profile within the frequency band based on current EEG data received;

determining, using the processor, the optimum wake time;

wherein determining the optimum wake time is based on using the dominant oscillation of power to predict one of a relative low point and a relative high point on the power profile proximate in time to and before the end of a user-specified sleep period; and

wherein one of the relative low point and the relative high point corresponds to the optimum wake time resulting in minimal sleep inertia; and

providing, using an alarm, a stimulus to wake the user at the determined optimum wake time.

13. The method of claim 12 wherein the frequency band is a delta band, further comprising:

filtering the delta band to generate a delta power rhythm.

14. The method of claim 12, further comprising:

measuring, using the receiver, brain activity of a user to collect the data.

15. The method of claim 12, wherein the data further comprises data associated with circadian oscillators and wherein determining the optimum wake time is also based on the data associated with the circadian oscillators.

16. The method of claim 12, wherein the data further comprises data associated with sleep debt or sleep propensity and wherein determining the optimum wake time is also based on the data associated with sleep debt or sleep propensity.

17. The method of claim 12, wherein the frequency and phase of the dominant oscillation determines the relative low point or the relative high point on the power profile corresponding to the optimum wake time.